<template>
  <div class="list" ref="wrapper">
    <div class="content">
      <div class="area">
        <div class="title border-topbottom">您的位置</div>
        <div class="button-list">
          <div class="button-wrapper">
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom ">热门城市</div>
        <div class="button-list">
          <div class="button-wrapper"
               v-for="item of hotCities"
               :key="item.id"
               @click="handleCityClick(item.name)"
          >
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area"
           v-for="(item,key) of cities"
           :key="key"
           :ref="key"
      >
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div class="item border-bottom"
               v-for="innerItem of item"
               :key="innerItem.id"
               @click="handleCityClick(innerItem.name)"
          >
            {{innerItem.name}}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
  import Bscroll from 'better-scroll'
  import {mapState,mapMutations} from 'vuex'
  export default {
    name: "CityList",
    props:{
      cities:Object,
      hotCities:Array,
      letter:String
    },
    computed:{
      ...mapState({
        currentCity:'city'
      })
    },
    methods:{
      handleCityClick(city){
        //需要修改公用数据时，要调用dispatch方法，触发action,把changeCity函数在action中执行
        // this.$store.commit('changeCity',city);
        this.changeCity(city);
        this.$router.push('/');
      },
      ...mapMutations(['changeCity'])
    },
    watch:{
      letter(){
        if(this.letter){
          const element = this.$refs[this.letter][0];
          this.scroll.scrollToElement(element);
        }
      }
    },
    mounted (){
      this.scroll = new Bscroll(this.$refs.wrapper);
    }

  }
</script>

<style scoped lang="stylus">
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc
    &:after
      border-color:#ccc
  .border-bottom
    &:before
      border-color:#ccc
  .list
    overflow:hidden
    position:absolute
    top:1.58rem
    left:0
    right:0
    bottom:0
    .title
      line-height:.54rem
      background: #eee
      padding-left:.2rem
      color:#666
      font-size:.26rem
    .button-list
      overflow:hidden
      padding:.1rem .6rem .1rem .1rem
      .button-wrapper
        float:left
        width: 33.33%
        .button
          margin:.1rem
          padding:.1rem 0
          border-radius:.06rem
          text-align:center
          border:.02rem solid #ccc
    .item-list
      .item
        line-height:.72rem
        color:#666
        padding-left:.2rem

</style>
